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Force.com Developer Certification Handbook (DEV401) by Siddhesh Kabe

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Overview of Visualforce

Visualforce is a markup language that uses syntax similar to HTML and XML, to easily create rich-interfaces. The UI designed by Visualforce is feature rich and can be used to make pages compatible with multiple mobile devices and browsers.

Visualforce uses XML-like syntax at the front-end to design pages and APEX as a back-end to implement business logic.

Visualforce content

A Visualforce page is finally rendered into HTML, so a Visualforce page can be a combination of Visualforce tags, HTML, and JavaScript.

Any other code that requires HTML and JavaScript can be used inside Visualforce, such as an embed tag for flash. We can create a Visualforce page up to 15 Mb, however, it is recommended to keep pages as small as possible. ...

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